A Reference numberISO 2738:1999(E)

INTERNATIONALSTANDARD

ISO2738

Third edition1999-11-01

Sintered metal materials, excludinghardmetals — Permeable sintered metalmaterials — Determination of density, oilcontent and open porosity

Matériaux métalliques frittés, à l'exclusion des métaux-durs — Matériauxmétalliques frittés perméables — Détermination de la masse volumique, dela teneur en huile et de la porosité ouverte

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ISO 2738:1999(E)

© ISO 1999

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Organization for StandardizationCase postale 56 • CH-1211 Genève 20 • SwitzerlandInternet iso@iso.ch

Printed in Switzerland

ii

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 2738 was prepared by Technical Committee ISO/TC 119, Powder metallurgy,Subcommittee SC 3, Sampling and testing methods for sintered metal materials (excluding hardmetals).

This third edition cancels and replaces the second edition (ISO 2738:1987) which has been technically revised.

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INTERNATIONAL STANDARD © ISO ISO 2738:1999(E)

1

Sintered metal materials, excluding hardmetals — Permeablesintered metal materials — Determination of density, oil contentand open porosity

1 Scope

This international Standard specifies methods of determining the density, oil content and open porosity ofpermeable sintered metal materials.

It applies in particular to porous metal bearings and to structural parts produced by pressing and sintering metalpowders.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions ofthis International Standard. For dated references, subsequent amendments to, or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forundated references, the latest edition of the normative document referred to applies. Members of ISO and IECmaintain registers of currently valid International Standards.

ISO 758, Liquid chemical products for industrial use — Determination of density at 20 °C.

ISO 13944, Lubricated metal-powder mixes — Determination of lubricant content — Modified Soxhlet extractionmethod.

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ISO 2738:1999(E) © ISO

2

3 Symbols and designations

Table 1 — Symbols and designations

Symbol Designation Unit

m1 Initial mass of the test piece g

m2 Mass of the test piece after oil extraction and drying g

m3 Mass of the fully impregnated test piece g

ma Mass of the fully or partially impregnated test piece plus supporting device (forexample suspension wire) weighed in air

g

mw Mass of the fully or partially impregnated test piece plus supporting device (forexample suspension wire) weighed in water

g

V Volume of the test piece cm3

rw Density of the water used g/cm3

r1 Density of the oil initially in the test piece a g/cm3

r2 Density of the impregnating oil used a g/cm3

a The oil density is assumed to be known or, if not, to be determined in accordance with ISO 758.

4 Terms and definitions

For the purposes of this International Standard the following terms and definitions apply.

4.1 densitythe density of the test piece may be expressed in two ways:

4.1.1dry densitythe mass, after drying, divided by the volume

4.1.2fully impregnated density (wet density)the fully impregnated mass divided by the volume

4.2 oil contentthe oil content of the test piece may be expressed in two ways:

4.2.1percentage by volumethe volume of the oil divided by the volume of the test piece and multiplied by 100

4.2.2percentage of the volume of the open porositythe volume of the oil divided by the volume of the open porosity and multiplied by 100

4.3 open porosity (of the test piece)the oil content after full impregnation divided by the volume of the test piece and multiplied by 100 expressed as apercentage by volume

4.4 volume (of the test piece)total volume including the pores

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